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Altera_Forum
Honored Contributor
14 years agohelp please......frequency divider
how to convert 25Mhz to 1hz,2hz till 10 hz....?
and use level select to select the frequency..this is the detail: level 1-10 will select to frequency 1Hz to 10Hz.. i just can do till 1 Hz only but still dont know whether its correct or not....:( tq....12 Replies
- Altera_Forum
Honored Contributor
if im using std_logic_vector type...how?
generic(n: natural :=25); port( divCLK: in std_logic; level:in std_logic_vector (3 downto 0); Q: out std_logic); end countersystem; ---------------------------------------------------- architecture behv of countersystem is signal clkdiv: std_logic_vector(n-1 downto 0); begin process(divCLK) begin if rising_edge(divCLK) then clkdiv <= clkdiv + 1; end if; Q<=clkdiv(24); from this i can get 1Hz, but how to get 2Hz,3Hz and so on from these coding... is it Q<=clkdiv(23),Q<=clkdiv(22)...and so on? - Altera_Forum
Honored Contributor
--- Quote Start --- how to convert 25Mhz to 1hz,2hz till 10 hz....? and use level select to select the frequency..this is the detail: level 1-10 will select to frequency 1Hz to 10Hz.. --- Quote End --- A counter that counts down from either 12,500,000 (1 Hz); 6,250,000 (2 Hz)...1,250,000 (10 Hz) would be a place to start. When the counter counts down and rolls over from 0 back to the max listed above, then toggle the output clock. --- Quote Start --- i just can do till 1 Hz only but still dont know whether its correct or not....:( tq.... --- Quote End --- Use a simulator and measure the output clock period. Kevin Jennings